<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    var a = Number(prompt('请输入0-6中的一个数字'))
    switch(a){
        case 0:
            console.log("星期日");
            break
        case 1:
            console.log("星期一");
            break
        case 2:
            console.log("星期二");
            break
        case 3:
            console.log("星期三");
            break
        case 4:
            console.log("星期四");
            break
        case 5:
            console.log("星期五");
            break
        case 6:
            console.log("星期六");
            break
        default:console.log('请输入0-6之间的数字')
    }
</script>
</html>